[dpdk-dev] Traffic scheduling in DPDK

Singh, Jasvinder jasvinder.singh at intel.com
Tue Jan 5 11:09:56 CET 2016


Hi Uday,

> 
> Thanks Jasvinder , I am running the below command
> 
> ./build/qos_sched -c 0xe -n 1  -- --pfc "0,1,3,2" --cfg ./profile.cfg
> 
> Bound two 1G physical ports to DPDK , and started running the above
> command with the default profile mentioned in profile.cfg .
> I am using lcore 3 and 2 for RX and TX. It was not successful, getting the
> below error.
> 
> APP: Initializing port 0... PMD: eth_igb_rx_queue_setup():
> sw_ring=0x7f5b20ba2240 hw_ring=0x7f5b20ba2680 dma_addr=0xbf87a2680
> PMD: eth_igb_tx_queue_setup(): To improve 1G driver performance,
> consider setting the TX WTHRESH value to 4, 8, or 16.
> PMD: eth_igb_tx_queue_setup(): sw_ring=0x7f5b20b910c0
> hw_ring=0x7f5b20b92100 dma_addr=0xbf8792100
> PMD: eth_igb_start(): <<
> done:  Link Up - speed 1000 Mbps - full-duplex
> APP: Initializing port 1... PMD: eth_igb_rx_queue_setup():
> sw_ring=0x7f5b20b80a40 hw_ring=0x7f5b20b80e80 dma_addr=0xbf8780e80
> PMD: eth_igb_tx_queue_setup(): To improve 1G driver performance,
> consider setting the TX WTHRESH value to 4, 8, or 16.
> PMD: eth_igb_tx_queue_setup(): sw_ring=0x7f5b20b6f8c0
> hw_ring=0x7f5b20b70900 dma_addr=0xbf8770900
> PMD: eth_igb_start(): <<
> done:  Link Up - speed 1000 Mbps - full-duplex
> SCHED: Low level config for pipe profile 0:
>     Token bucket: period = 3277, credits per period = 8, size = 1000000
>     Traffic classes: period = 5000000, credits per period = [12207, 12207, 12207,
> 12207]
>     Traffic class 3 oversubscription: weight = 0
>     WRR cost: [1, 1, 1, 1], [1, 1, 1, 1], [1, 1, 1, 1], [1, 1, 1, 1]
> EAL: Error - exiting with code: 1
>   Cause: Unable to config sched subport 0, err=-2


In default profile.cfg, It is assumed that all the nic ports have 10 Gbps rate. The above error occurs when subport's  tb_rate (10Gbps) is found more than NIC port's capacity (1 Gbps). Therefore, you need to use either 10 Gbps ports in your application or have to amend the profile.cfg to work with 1 Gbps port.  Please refer to  DPDK QoS framework document for more details on various parameters - http://dpdk.org/doc/guides/prog_guide/qos_framework.html


> -----Original Message-----
> From: Singh, Jasvinder [mailto:jasvinder.singh at intel.com]
> Sent: Monday, January 04, 2016 9:26 PM
> To: Ravulakollu Udaya Kumar (WT01 - Product Engineering Service);
> dev at dpdk.org
> Subject: RE: [dpdk-dev] Traffic scheduling in DPDK
> 
> Hi Uday,
> 
> 
> > I have an issue in running qos_sched application in DPDK .Could
> > someone tell me how to run the command  and what each parameter does
> > In the below mentioned text.
> >
> > Application mandatory parameters:
> >     --pfc "RX PORT, TX PORT, RX LCORE, WT LCORE" : Packet flow
> configuration
> >            multiple pfc can be configured in command line
> 
> 
> RX PORT - Specifies the packets receive port TX PORT - Specifies the packets
> transmit port RXCORE - Specifies the  Core used for Packet reception and
> Classification stage of the QoS application.
> WTCORE-  Specifies the  Core used for Packet enqueue/dequeue operation
> (QoS scheduling)  and subsequently transmitting the packets out.
> 
> Multiple pfc  can be specified depending upon the number of instances of
> qos sched required in application.  For example- in order to run two instance,
> following can be used-
> 
> ./build/qos_sched -c 0x7e -n 4 -- --pfc "0,1,2,3,4" --pfc "2,3,5,6" --cfg
> "profile.cfg"
> 
> First instance of qos sched receives packets from port 0 and transmits its
> packets through port 1 ,while second qos sched will receives packets from
> port 2 and transmit through port 3. In case of single qos sched instance,
> following can be used-
> 
> ./build/qos_sched -c 0x1e -n 4 -- --pfc "0,1,2,3,4" --cfg "profile.cfg"
> 
> 
> Thanks,
> Jasvinder
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